[IMP] barcodes: allow immediate quantity input after scanning

When scanning items with a device like the Symbol MC3200 you are
presented with the Kanban view because of it's limited resolution.

In this view it is not possible to quickly set the quantity of scanned
products. Ideally users just want to scan the barcode, input the
quantity and repeat without having to click on virtual buttons on the
usually less than ideal touchscreen.

This implements a way for users to immediately start typing numbers
representing a quantity after scanning a barcode. The quantity will be
set on the specified m2x_field.quantity_field of the record associated
to the last scanned barcode. Because KanbanRecords are not editable
without opening a new view window.prompt is used. It will create an easy
to use native dialog of whatever device is being used. It also avoids us
having to implement a custom input field which would have to handle
keypress events like numbers, backspace, delete, etc.

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